Form for supporting monolithic slabs of cementitious material



1931- H. E. MARKS 1,819,906

FORM FOR SUPPORTING MONOLITHIC SLABS OF CEMENTITIOUS MATERIAL FiledMarch 3, 1928 V awxzzz azz'aiasaswzzxm III Jig. 5.

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Patented Aug. 18, 1931 UNITED STATES PATENT OFFICE HERBERT E. MARKS, OFGLEN OSBORNE, SEWICKLE'Y, PENNSYLVANIA, ASSIGNOR TO UNITED STATES GYPSUMCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS FORM FORSUPPORTING MONOLITHIC Application filed. March 3,

' tious material, such as gypsum, concrete and the like, until thematerial sets to form a monolithic slab.

The object of the invention is to provide an inexpensive form which maybe easily erected, which when erected effectively, serves its intendedpurpose, and which after a slab has been set may be easily removed foruse in a different location.

In the accompanying drawings, Fig. 1 is a vertical sectional viewthrough a pair of adjacent floor beams or roof purlins and through aform provided according to the invention; Fig. 2 a perspective view of aform-supporting loop; Figs. 3 and 4 views of modifications of the loopof Fig. 2; Figs. 5 and 6 sectional views taken on the lines VV and VIVI,respectively, Fig. 1; and Fig. '17 a perspective view of a modified formof oop.

According to this invention spaced roof purlins or floor beams,hereinafter designated collectively as beams, are engaged by wire straploops provided with projections which engage bars extending from beam tobeam, the bars forming supports for a platform on which cementitiousmaterial is poured to form a monolithic slab.

In the illustrative embodiment of the invention there are shown twobeams 1 and 2 in the form of channels engaged by wire loops 3, which maybe, and preferably are, of the general form illustrated t'o enlargedscale in Fig. 2. The vertically disposed sides of each loop are providedwith laterally-extending portions for engaging platformsupporting bars 4which are preferably provided with openings for receiving such portions.As seen in Fig. 2, the side of loop 3 adjacent to the trough face ofbeam 1 is bent to form a projection 5 which extends through an opening 6adjacent to the end of bar 4. The other side of the loop, namely, thatadjacent to the back or plane face of the beam may also be provided witha similar projection 5a, the side of the loop being stretched outwardlyto engage an opening 7 closer to the end of a bar 8 than the opening 6in bar SLABS or CEMENTITIOUS MATERIAL 1928. Serial no. 25s,s42.

4. The meeting faces of the portions of the wire loop which form thebar-engaging projections 5 and 5a may be welded together as shown inFig. 2, or the wire which forms these projections may be twistedtogether as shown at 11 in Fig. 3, although it will be understood thatit is unnecessary to either weld or twist these projections. As afurther modification, the loop may be formed of sections of wire, theends of which are bent outwardly and welded to each other to form aprojection 12, as shown in Fig. 4.

While the platform supporting bars may be of any suitable form andconstruction, each is preferably made of a pair of small flangedsections which may be in the form of channels 4 and 8 arranged back toback for telescopic adjustment as seen particularly in Fig. 6. Thechannels are rendered rigid in their variably adjusted positions bymeans of stirrups 14 which are attached to one of the channels, as bybolts 15, and which are so shaped as to conform to the lower flanges ofthe channels and to engage their webs. By this construction channel 4may be slipped into stirrups 14 attached to channel 8, and, within thecustomary variations in spans between beams, may be adjusted to anydesired length for forming a platform-supporting bar. This eliminatesthe necessity of providing adjustable platform bars with holes or slotsfor receiving bolts or pins for connecting them to form a rigid support,and affords a support having a range of adjustment unlimited by thespacing of holes or the lengths of slots.

In erecting the platform provided according to this invention, thespaced beams are first provided with wire loops arranged at desiredintervals. For attaching a loop to a beam, its upper free ends may, asshown in Fig. 1, be bent laterally to engage a ring 16 previouslyslipped over them, or, if desired, the upper ends of the loops may betwisted together in the manner generally illustrated in Fig. 3.Platform-supporting bars are then arranged between adjacent beams, andthe lateral projections 5 and 5a of the wire loops are placed in theopenings at the end of the bars. To prevent the bars from slipping offprovided where necessary with kerfs or holes 18 to receive the verticalportions of the wire loops. To avoid the necessity oflongitudinallycutting a platform board 17 when the space between adjacent beams is nota multi- 'ple of the widths of boards 17, a flat sheet of metal 22 maybe used to span the odd width ga as shown in Fig. 1.

ff the monolithic floor is of the suspension type, tension wires 19 maybe deflected at the center of each span by a rod 20 which may be tieddownwardly in its wire-deflecting position by wires 21, or equivalentmembers, extending through the platform and engaging the platformsupporting bars 4, 8. Thus there is avoided the necessity of rovidingspecial members arranged below t e beams for tying down the suspensionreinforcement. The attachment of the ends of the platform formed withintegral laterally-extending portions, and longitudinally adjustableplatform-supporting bars extending from one to another of said beams,provided at their ends with openings through which saidlaterallyextending loop portions project for supporting the bars againstdownward and upward movements.

2. A form for supporting a monolithic slab of cementitious material,comprising spaced beams, Wire loops enclosing said beams, the ends ofsaid loops being secured together above said beams, integral, laterallyextending projections formed on said wire loops intermediate the top andbottom thereof, and platform supporting bars extending from one toanother of said beams, and provided at their ends with openings throughwhich said laterally extending projections extend for supporting thebars against downward and upward movements.

In testimony whereof, I sign In name. HERBERT E. ARKS.

supporting bars to the loops is such as to ef- Y fectively resist eitheran upward pull of the tension reinforcement, or to support the weight ofthe platform and slab oured upon it. In case a suspension type of flooris not laid upon the latform, or if special means are provided orholding the tension rods downwardly, the lower portions of the loops maybe omitted, and in place thereof a. saddle 23 such as shown in Fig. 7may be used.

With the form thus assembled, a cementitious body of gypsum, concrete orthe like, is poured upon the platform to the desired depth and permittedto set. After the slab has set, the form may be lowered by moving theplatform bars laterally from their engagement with the wire loopprojections, the projections being first cut off or turned to horizontalpositions if previously bent otherwise. After the bars 'and platformsupported by them are thus removed, the lower portion of the wire loopsmay beclipped off flush with the lower face of the slab, and the barsand platform used in a different location.

According to the provisions of the atent statutes, I have explained theprincip e and operation of my invention, and have illustrated anddescribed several embodiments of it. However, I desire to have itunderstood that, within the scope of the appended claims, the inventionmay be practlced by other forms of construction than that specificallyillustrated and described.

